Yvonne said: “Tristan was suddenly able to make eye contact and became more alert.

“He began to babble, repeat sounds and say new words – all of which had vanished since his spate of violent seizures last May when he stopped talking altogether.

“During the second week he began to get steadier on his feet, he wasn’t falling after a few steps, he was bending with stability. He would sit down without help and he began to kick a ball.

“His seizure activity lessened with every few days and once he had been increased to his optimum dose with the introduction of tiny amounts of THC, he was 99% seizure-free and has been ever since.”

In fact, Tristan has not had a seizure in three months and hasn’t needed rescue medication or oxygen since beginning cannabis oil treatment. His appetite and sleep have improved significantly and for the first time he can take part in normal everyday activities.

Tristan Cahalane, whose family are fundraising to bring him to the US to get medical marijuana treatment for his severe epilepsy